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PRODID:-//Event Calendar 2.0//iCal4j 2.0//EN
CALSCALE:GREGORIAN
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DTSTAMP:20261007T000435Z
DTSTART:20260908T110000
DTEND:20260908T120000
SUMMARY:Nadiia Kostogryz: Stellar surface magnetic field: Effects on Limb Darkening and Granulation Flicker
TZID:Europe/Berlin
UID:event-1787997402150@events.goettingen-campus.de
LOCATION:Max-Planck-Institut für Sonnensystemforschung (MPS) - Auditorium
CONTACT:seminar@mps.mpg.de\, seminar@mps.mpg.de
CATEGORIES:research
DESCRIPTION:Magnetic fields shape the surfaces of cool stars\, even when the star appears photometrically quiet. In this seminar\, I will discuss how small-scale surface magnetism affects two key stellar signals relevant for exoplanet and stellar studies: limb darkening and granulation-driven brightness variability\, or flicker. Using 3D radiative magnetohydrodynamic simulations with MURaM\, combined with spectral synthesis using MPS-ATLAS\, we investigate how magnetic fields modify the center-to-limb intensity variation and the wavelength dependence of flicker. I will show that magnetic flux concentrations can make limb darkening shallower\, alter the spectral shape of flicker\, and introduce wavelength-dependent stellar signals that may affect transit and transmission-spectroscopy analyses. These results highlight the need to include realistic magnetic stellar atmospheres when interpreting high-precision observations from Kepler\, TESS\, JWST\, and PLATO.\n\nTitle: Solar and Stellar Group Seminar: Stellar surface magnetic field: Effects on Limb Darkening and Granulation Flicker\nSpeaker: Nadiia Kostogryz\nOrganizer: Max-Planck-Institut für Sonnensystemforschung\nHost: Robert Cameron\nContact: seminar@mps.mpg.de\, seminar@mps.mpg.de\n
URL:https://events.goettingen-campus.de/event?eventId=1787997402150
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